Sewing-machine shuttle



Jan. 8. 1924.

E.. D. COLLINS SEWING MACHINE SHUTTLE Filed Feb. 11. 1922 INV swim? I AT TURN EYE Patented Jan. 8, 1924.

FATE QFFE EDWIN D. COLLINS, OF BEECHVTOOD, NEW JERSEY, ASSIGNOR TO SUMMIT THREAD COMPANY, OF EAST HAMPTON, CONNECTICUT, A CORPORATION OF MAINE.

snwrne-nncnrnn SHUTTLE.

Application filed February 11, 1922. Serial No. 535,723.

To all whom it may concern:

Be it known that I, EDWIN D. COLLINS, a citizen of the United States, residing at Beechwood, in the State of New Jersey, have invented new and useful Improvements in Sewing-Machine Shuttles, of which the following is a specification.

This invention relates to a rotary shuttle of the Willcox & Gibbs type, comprising a circular wall forming a bobbin-chamber adapted to contain a universally-wound bobbin, a fixed cross-bar extending acrossthe inner end of the'chamber, a fixed tubular post on the cross-bar centrally located in the chamber, an externally polygonal bobbin core-engaging sleeve mounted to rotate on the post, and means associated with the post and sleeve for confining the sleeve against free removal from the post, so that the bob bin core may be removed from the sleeve without removing the sleeve from the post.

The polygonal perimeter of the sleeve presents salient angles, adapted to bear on the internal surface of the cylindrical paper tube forming the core of a universallywound bobbin. There is usually a slight variation in the internal diameter of the cores of different bobbins, so that while the salient angles of the sleeve are adapted to indent a core of minimum diameter, and prevent loose or accidental removal of the core from the sleeve when the shuttle is being manipulated, while disconnected from the sewing-machine, a core of larger internal diameter is so loosely engaged with the sleeve that it is liable to slip from the post when the latter is inverted. This liability involves loss of time in recovering a bobbin whose core is accidentally removed from the sleeve.

The object of the invention is to enable the polygonal sleeve to so engage bobbin cores of different internal diameters, as to prevent liability of the accidental removal of the core, and the thread winding thereon, from the sleeve.

The invention consists in the improved form of the sleeve hereinafter described and claimed.

Of the accompanying drawings forming a part of this specification,

Figure 1 is a plan view, on an enlarged scale, of a shuttle having a sleeve embodying the invention, and of a bobbin engaged with the sleeve.

Figure 2 is a section Figure 1.

Figure 2 is a view similar to Figure 2, certain parts shown by Figure 2 being omitted. t

Figure 3 is a perspective the sleeve on a larger scale. 1

Figures 4 and. 5 are side views of parts shown by Figure 2, separated from the shuttle.

The same reference characters indicate the same parts in all of the'figures.

12 represents the circular wall of a rotary Willcox'& Gibbs shuttle, said wall forming a chamber adapted to contain the tubular paper core 13 and thread winding 14 constituting a universally-wound bobbin of well known form. 15 represents a cross-bar fixed to the wall and extendin across one end of the chamber, said crossar supporting a tubular post 16. 17 represents an externally polygonal sleeve mounted to rotate on the base portion of the post, and provided with salient angles 17* adapted to bear on the internal surface of the core 13. The post is provided with the usual means for preon line 22 of View, showing venting loose removal of the sleeve 17 from,

the post, said means being embodied as fol-- lows:.

The sleeve is provided near its outer end with an inwardly projecting annular flange 19, one side of which forms a seat for the head 20 of a tubular stud 21, which is split longitudinally at one side, as shown at 22. The stud has a close fit in the bore of the post 16, and has an internally threaded bore with which is engaged a screw 23 having a tapered head 24. After the sleeve is placed on the post, the stud 21 is inserted in the opening surrounded by the sleeve flange 19, and the screw 28 is screwed into the threaded bore of the stud until its head 24 expands the split stud into a firm binding engagement with the bore of the post 16, the stud being thus confined so that its head 20 prevents removal of the sleeve from the post, the sleeve being at the same time free to rotate on the post. Unclesirably loose and free rotation of the sleeve on the post is prevented by the cooperation of a spring 26 with the stud head 20, and with the sleeve flange 19, said spring surrounding a reduced portion of the post and acting to press the sleeve flange 19 against the stud head 20.

The construction thus far described, in-

cluding the structural features shown by the drawing and, not described, is Well known.

In carrying out my invention, I provide the sleeve 17 with serrations 27 so arran ed as to indent portions of the internal surface of the bobbin core 13, and compensate for variations in the internal diameters of different cores, and prevent liability. of the,

accidental removal of any core and its thread Winding fromthe sleeve.

The serrations are arranged to project;

tool being so formed and directed that, its

impact displaces portions, of the,metal Of the sleeve and forms serrations or barbs offering more resistance to the removal of; the core from the sleeve, than to its appli cation to the sleeve.

I prefer to locate. the serrations at, the inner end portion of the sleeve and in gronps of tWo or more, three being the preferred;

number. I also prefer, to serrate or. barb against said angles, the

namsev each alternate angle 17?, leaving the others plain, as, indicated by Figure 3.

I claim: a

A sewing machine shuttle comprising a bobbin chamber, a fiXed'cross-bar extending across the inner end of the chamber, a fixed tubular post on said cross-bar centrally located in said chamber, an externally polygonal bobbin-core engaging sleeve, mounted to rotate 011mm post, and adapted to bear on the internal surface of a bobbin core, salient angles ofthe sleeve being provided With barbs projecting outward from the sleeve and adapted to permit a bobbin to bereadily positioned on the sleeve and to indent thecore and resist removal thereof, and means associated with the post and sleeve for confining the sleeve againstfree removal from thepost and forfrictionally retarding rotation of the sleeve and a bobbin engaged fl er w te testimony: \vhereof I have affixed my signature i EDWIN D. conta ns. 

